The early evolution of the planet earth and the origin of life

Oschmann, Wolfgang; Grasshof, Manfred; Gudo, Michael

doi:10.1007/bf03043789

Cited by 7 publications

(4 citation statements)

References 40 publications

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“…Currently, oxygenic phototrophs, deriving their energy from light, are regarded as the most important carbon fixers. However, on planetary time scales anoxygenic phototrophs and chemotrophs have been more prevalent ( 1 ). Even today, chemolithoautotrophy is a major strategy in many environments, such as deep-sea vents and sediments ( 2 – 4 ).…”

Section: Introductionmentioning

confidence: 99%

Novel Autotrophic Organisms Contribute Significantly to the Internal Carbon Cycling Potential of a Boreal Lake

Peura

Buck

Aalto

et al. 2018

mBio

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Oxygen-stratified lakes are typical for the boreal zone and also a major source of greenhouse gas emissions in the region. Due to shallow light penetration, restricting the growth of phototrophic organisms, and large allochthonous organic carbon inputs from the catchment area, the lake metabolism is expected to be dominated by heterotrophic organisms. In this study, we test this assumption and show that the potential for autotrophic carbon fixation and internal carbon cycling is high throughout the water column. Further, we show that during the summer stratification carbon fixation can exceed respiration in a boreal lake even below the euphotic zone. Metagenome-assembled genomes and 16S profiling of a vertical transect of the lake revealed multiple organisms in an oxygen-depleted compartment belonging to novel or poorly characterized phyla. Many of these organisms were chemolithotrophic, potentially deriving their energy from reactions related to sulfur, iron, and nitrogen transformations. The community, as well as the functions, was stratified along the redox gradient. The autotrophic potential in the lake metagenome below the oxygenic zone was high, pointing toward a need for revising our concepts of internal carbon cycling in boreal lakes. Further, the importance of chemolithoautotrophy for the internal carbon cycling suggests that many predicted climate change-associated fluctuations in the physical properties of the lake, such as altered mixing patterns, likely have consequences for the whole-lake metabolism even beyond the impact to the phototrophic community.

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Section: Introductionmentioning

confidence: 99%

Novel Autotrophic Organisms Contribute Significantly to the Internal Carbon Cycling Potential of a Boreal Lake

Peura

Buck

Aalto

et al. 2018

mBio

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show abstract

“…Currently, oxygenic phototrophs, deriving their energy from the sun light, are regarded as the most important carbon fixers. However, on planetary time scales anoxygenic phototrophs and chemotrophs have been more prevalent (1). Even today chemolithoautotrophy is a major strategy in many environments, such as deep-sea vents and sediments (2-4).…”

Section: Introductionmentioning

confidence: 99%

Novel autotrophic organisms contribute significantly to the internal carbon cycling potential of a boreal lake

Peura

Buck

Aalto

et al. 2018

Preprint

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36Oxygen stratified lakes are typical for the boreal zone, and also a major source of 37 greenhouse gas emissions in the region. Due to shallow light penetration, restricting 38 the growth of phototrophic organisms, and large allochthonous organic carbon 39 inputs from the catchment area, the lake metabolism is expected to be dominated by 40 heterotrophic organisms. In this study we test this assumption and show that the 41 potential for autotrophic carbon fixation and internal carbon cycling is high 42 throughout the water column. Further, we show that during the summer 43 stratification carbon fixation can exceed respiration in a boreal lake even below the 44 euphotic zone. Metagenome assembled genomes and 16S profiling of a vertical 45 transect of the lake revealed multiple organisms in oxygen depleted compartment 46 belonging to novel or poorly characterized phyla. Many of these organisms were 47Importance 58Autotrophic organisms at the base of the food web are the only life form capable of 59 turning inorganic carbon into organic form, facilitating the survival of all other 60 organisms. In certain environments the autotrophic production is limited by 61 environmental conditions and the food web is supported by carbon coming from 62 outside the ecosystem. One such environment is stratified boreal lakes, which are 63 one of the biggest sources of greenhouse gas emissions in the boreal region. Thus, 64 carbon cycling in these habitats is of outmost importance for the future climate. 65Here we demonstrate a high potential for internal carbon cycling via phototrophic 66 and novel chemolithotrophic organisms in the dark and anoxic layers of a boreal 67 lake. Our results significantly increase our knowledge on the microbial communities 68 and their metabolic potential in oxygen depleted freshwaters and help to 69 understand and predict how climate change induced alterations could impact the 70 lake carbon dynamics. 71 72 73 74 75

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“…Although they have been eliminated from our data after filtration related to low count-related filtration, we revealed that a more detailed study should be carried out regarding this evolutionarily important group. In comparison to prokaryotes, evidence suggests that eukaryotes have a poorer thermal tolerance [ 43 ]. This could be related to each group’s biological traits.…”

Section: Discussionmentioning

confidence: 99%

“…This could be related to each group’s biological traits. Bacteria first appeared and evolved at a period when the earth was subjected to high temperatures [ 44 ], and there are today bacteria that can survive in extreme temperatures [ 43 ].…”

Section: Discussionmentioning

confidence: 99%

Revealing the Microbiome of Four Different Thermal Springs in Turkey with Environmental DNA Metabarcoding

Çelik

Keskin

2022

Biology

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One of the most significant challenges for detecting microbial life in thermal springs by conventional techniques such as culturing is these places’ physicochemical (temperature, heavy metal content, pH, etc.) conditions. Data from several studies suggest that high-throughput DNA sequencing technologies can be used to perform more accurate and detailed microbiome analyses. The primary aim of this paper was to determine the microbiome in the thermal source by metabarcoding environmental DNA isolated from four different sources and reveal the reflection of differences caused by temperature and chemical content on the microbiome. DNA was extracted from water filtered with enclosed filters and using the Illumina high-throughput sequencing platform, V3 and V4 regions of the 16S rRNA gene were sequenced. The results showed a correlation between physicochemical conditions and microorganism composition of four different thermal springs. Springs with extremely high temperature (89–90 °C) were dominated by hyperthermophiles such as Hydrogenobacter and Thermus, while a spring with a high temperature (52 °C) was dominated by thermophiles such as Thermoanaerobaculum and Desulfurispora, and a spring with a low temperature (26 °C) and high salinity was dominated by halophiles and sulfur-oxidizers such as Hydrogenovibrio and Sulfirimonas. With this research, we observed many manipulable steps according to the work of interest. This study sought to obtain data that will help decide the right gene region and choose the optimal bioinformatic pipeline.

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The early evolution of the planet earth and the origin of life

Cited by 7 publications

References 40 publications

Novel Autotrophic Organisms Contribute Significantly to the Internal Carbon Cycling Potential of a Boreal Lake

Novel Autotrophic Organisms Contribute Significantly to the Internal Carbon Cycling Potential of a Boreal Lake

Novel autotrophic organisms contribute significantly to the internal carbon cycling potential of a boreal lake

Revealing the Microbiome of Four Different Thermal Springs in Turkey with Environmental DNA Metabarcoding

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